MESON Chess Problem Database

Problem Display
PID: 21505 (K4b2/5pq1/1PB1N3/pR1P4/k1n1n3/pp2r2r/1p6/RQ1N4 w - - 0 1)

Guidelli, Giorgio

Good Companions (January), 1919

K4b2/5pq1/1PB1N3/pR1P4/k1n1n3/pp2r2r/1p6/RQ1N4

#2

9 + 12

3132 The Good Companion Two-Mover 1922

SOLUTION

  • SOUND
  • Sets
    • 1...Bb4
      • 2.Rc5#
    • 1...Se5
      • 2.Sxb2#
    • 1...Sxb6+
      • 2.Rxb6#
    • 1...Sd6
      • 2.Sc5#
    • 1...bxa1Q
      • 2.Rxb3#
    • 1...bxa1S
      • 2.Rxb3#
    • 1...bxa1B
      • 2.Rxb3#
    • 1...bxa1R
      • 2.Rxb3#
  • Tries
    • 1.Rxa5+?
      • 1...Kb4
        • 2.Ra4#
      • 1...Kxa5!
    • 1.Qc2?
      • threat
        • 2.Rxb3#
      • 1...Sxb6+
        • 2.Rxb6#
      • 1...bxc2
        • 2.Rxb2#
      • 1...Bb4
        • 2.Rc5#
      • 1...Se5
        • 2.Sxb2#
      • 1...Sc3
        • 2.Qxb3#
      • 1...Sed6
        • 2.Sc5#
      • 1...Scd6!
  • Keys
    • 1.Qa2!
      • threat
        • 2.Rxb3#
      • 1...Sxb6+
        • 2.Rxb6#
      • 1...bxa2
        • 2.Rxb2#
      • 1...Bb4
        • 2.Rc5#
      • 1...Se5
        • 2.Sxb2#
      • 1...Scd6
        • 2.Qxa3#
      • 1...Sc3
        • 2.Qxb3#
      • 1...Sed6
        • 2.Sc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • B(l);SBLOCK::B(G)+R(D)
    • S(g);N_GUARD,S_CUTQ(k)::S(C),XP(a)
    • S(g);CHECK,OGATE,XP(F)::B(G)+R(D),XS(g)
    • S(h);N_GUARD,S_CUTB(l)::S(H)
    • P(a);N_SPINP(b),XR(A)::B(G)+R(D),XP(c)
  • Tries
    • Try
      • R(D);CHECK,XP(i)
      • Vars
        • K(f);N_SPINP(b),P-FLIGHT::R1(D)
      • Refutation
        • K(f);P-FLIGHT,XR(D)
    • Try
      • Q(B);
      • Threat
        • B(G)+R(D),XP(c)
      • Vars
        • S(g);CHECK,OGATE,XP(F)::B(G)+R(D),XS(g)
        • P(c);OGATE,XQ(B)::B(G)+R(D),XP(a)
        • B(l);SBLOCK::B(G)+R(D)
        • S(g);N_GUARD,S_CUTQ(k)::S(C),XP(a)
        • S(h);S_CUTR(d)::QAB1(B),XP(c)
        • S(h);N_GUARD,S_CUTB(l)::S(H)
      • Refutation
        • S(g);
  • Actual
    • Q(B);
    • Threat
      • B(G)+R(D),XP(c)
    • Vars
      • S(g);CHECK,OGATE,XP(F)::B(G)+R(D),XS(g)
      • P(c);N_SPINP(b),OGATE,XQ(B)::B(G)+R(D),XP(a)
      • B(l);SBLOCK::B(G)+R(D)
      • S(g);N_GUARD,S_CUTQ(k)::S(C),XP(a)
      • S(g);N_GUARD,S_CUTB(l)::QAR1(B),XP(b)
      • S(h);S_CUTR(d)::QAB1(B),XP(c)
      • S(h);N_GUARD,S_CUTB(l)::S(H)
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